[1 Mark Questions]

Question 11 Mark

When did Henry Cavendish discover Water?

Answer

Water was first prepared in 1781 by an English scientist Henry Cavendish.

Question 21 Mark

What is the taste of distilled water & boiled water?

Answer

No taste.

Question 31 Mark

Name the chemical which converts chlorides and sulphates into insoluble carbonates.

Answer

Washing soda.

Question 41 Mark

Name the process by which temporary hardness is easily removed from water.

Answer

Boiling.

Question 51 Mark

Define the following.
Potable water

Answer

The water suitable for drinking is called potable water.

Question 61 Mark

Define the following.
Latent heat of fusion

Answer

The amount of heat energy required by ice to change into water is called the latent heat of fusion of ice.

Question 71 Mark

Define the following.
Specific heat capacity

Answer

The amount of heat that is needed to raise the temperature of a unit mass of a substance by 1°C is called specific heat capacity.

Question 81 Mark

Define the following.
Boiling point

Answer

The temperature at which water boils and changes to steam is called as boiling point. The boiling point of water is 100°C at atmospheric pressure.

Question 91 Mark

Define the following.
Freezing point

Answer

The temperature at which a liquid turns into solid when cooled is known as the freezing point. The freezing point of water is 0°C.

Science [1 Mark Questions]